Electric fans
 

I'm thinking of adding twin electric fans to my 71 has a 327 right now, to help with the A/c... should I remove the water pump fan or leave it there...

Re: Electric fans
 

one or the other... Does your current fan have a shroud, the the stock set up when working correctly is enough to cool a big block with AC. What do you have as far as fan, radiator, clutch t-stat set up currently?

Re: Electric fans
 

Stock fan, has a shroud,no clutch on fan... works good when truck is moving but when in slow or stopped A/C starts to blow less cold A/C... but when I put it in N give it some gas it blows cold... Just thinks fans would work better. got stuck in traffic alot..

Re: Electric fans
 

You could just add a pusher fan in front of the radiator and leave the stock fan and shroud in place. I did that to a work truck for the same reason. Eventually I did have the A/C gone over by a good shop who evacuated and then refilled the system which largely negated the need to have the additional pusher fan.

But if you're going through the trouble of adding one fan it's not much more to add a pair with a new shroud. You're already going to be doing the wiring with relay, some sort of fan controller, etc. Throw a little more cash at and you can have a pair of fans with a shroud behind the radiator and get rid of the stock fan and shroud.

Re: Electric fans
 

So your not overheating, just the air does not blow as cold at idle? If your not overheating sounds like you need to have your AC checked for freon level.

Re: Electric fans
 

A/c is 134 and level is fine..

Re: Electric fans
 

Make sure you upgrade the alternator and wiring when you put the fans in. I didn't at first and the fans didn't work the way I wanted, found out that I was only at 10 amps at idle. Went to a 140amp Powermaster and twin spal fans, 4 gauge wiring across the front and it seems to fix the fax issue.

You may need your rad looked at, or your water pump is not working right. I replaced both and my big block rarely goes over 175, even in traffic. It has air as well.

Re: Electric fans
 

First I would check the air flow. Is it only pulling through the radiator are is it going around it, that is the biggest reason your cooling effect isn't working at idle and slow speed.

The air has to be pulled through the radiator to cool not going over under are to the sides.:chevy:

Re: Electric fans
 

Consider a flex-fan prior to all the work needed to convert to electric fans (alternator upgrade, wiring, temp sensor, etc). Flex fans are deigned to move more air at idle and flatten out as the RPM's increase.

As for the A/C issue, start by assuring there is ample Freon volume in the system, that the ductwork is opening and closing as it should, and the vacuum switched heater core shut off is working.

Re: Electric fans
 

It is completely normal for R134 to cool less at idle speed than at cruising speed. R134 operates better at higher pressure. Even the late model trucks cool less at idle speeds than running down the road. Part of it is air flow through the condenser and part of it is the increased compressor speed.